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class="post-meta-date-created" datetime="2021-01-15T03:59:05.132Z" title="发表于 2021-01-15 11:59:05">2021-01-15</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2021-04-19T12:00:11.990Z" title="更新于 2021-04-19 20:00:11">2021-04-19</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/Web%E5%89%8D%E7%AB%AF/">Web前端</a><i class="fas fa-angle-right post-meta-separator"></i><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/Web%E5%89%8D%E7%AB%AF/JavaScript/">JavaScript</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span class="post-meta-wordcount"><i class="far fa-file-word fa-fw post-meta-icon"></i><span class="post-meta-label">字数总计:</span><span class="word-count">2.4k</span><span class="post-meta-separator">|</span><i class="far fa-clock fa-fw post-meta-icon"></i><span class="post-meta-label">阅读时长:</span><span>10分钟</span></span><span class="post-meta-separator">|</span><span class="post-meta-pv-cv" id="" data-flag-title="JavaScript🌞对象"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="busuanzi_value_page_pv"></span></span></div></div></div><article class="post-content" id="article-container"><h1 id="对象"><a href="#对象" class="headerlink" title="对象"></a>对象</h1><ul>
<li>面向对象的特征主要可以概括为<strong>封装性、继承性、多态性</strong>。</li>
</ul>
<h2 id="自定义对象"><a href="#自定义对象" class="headerlink" title="自定义对象"></a>自定义对象</h2><h3 id="字面量-创建对象"><a href="#字面量-创建对象" class="headerlink" title="字面量{}创建对象"></a>字面量{}创建对象</h3><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"> <span class="keyword">var</span> o1=&#123;&#125;;</span><br><span class="line"> <span class="keyword">var</span> o2=&#123;<span class="attr">name</span>:<span class="string">&#x27;Jim&#x27;</span>&#125;;</span><br><span class="line"> <span class="keyword">var</span> o3=&#123;<span class="attr">name</span>:<span class="string">&#x27;Jim&#x27;</span>,<span class="attr">age</span>:<span class="number">19</span>,<span class="attr">gender</span>:<span class="string">&#x27;男&#x27;</span>&#125;;</span><br><span class="line"> <span class="keyword">var</span> o4 = &#123;</span><br><span class="line">   name: <span class="string">&#x27;Jim&#x27;</span>,</span><br><span class="line">   age: <span class="number">19</span>,</span><br><span class="line">   gender: <span class="string">&#x27;男&#x27;</span>,</span><br><span class="line">   sayHello: <span class="function"><span class="keyword">function</span>(<span class="params"></span>) </span>&#123;</span><br><span class="line">      <span class="built_in">console</span>.log(<span class="string">&#x27;你好&#x27;</span>);</span><br><span class="line">   &#125;</span><br><span class="line">&#125;;</span><br></pre></td></tr></table></figure>
<h3 id="访问对象成员"><a href="#访问对象成员" class="headerlink" title="访问对象成员"></a>访问对象成员</h3><ul>
<li>对象名.属性;</li>
<li>对象名.方法名()</li>
</ul>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">o4.name;</span><br><span class="line">o4.sayHello();</span><br></pre></td></tr></table></figure>
<h3 id="增加对象成员"><a href="#增加对象成员" class="headerlink" title="增加对象成员"></a>增加对象成员</h3><ul>
<li>引用不存在的成员，即增加成员</li>
</ul>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">o4.tall=<span class="number">181</span>;</span><br><span class="line">o4.introduce=<span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">   <span class="built_in">console</span>.log(o4.name+o4.tall);</span><br><span class="line">&#125;</span><br><span class="line">o4.introduce();</span><br></pre></td></tr></table></figure>
<h3 id="可变成员名"><a href="#可变成员名" class="headerlink" title="可变成员名"></a>可变成员名</h3><ul>
<li>如果对象的成员名不确定时，还可通过一个变量保存成员的名称，使用[]语法来实现可变成员名。<code>成员名：字符串</code></li>
</ul>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> key=<span class="string">&#x27;id&#x27;</span>;</span><br><span class="line">o4[key]=<span class="number">123</span>;</span><br></pre></td></tr></table></figure>

<h3 id="对象成员遍历"><a href="#对象成员遍历" class="headerlink" title="对象成员遍历"></a>对象成员遍历</h3><ul>
<li><code>typeof</code>：判断成员类型，<code>function</code>表示方法</li>
<li>访问方法：<code>o4[i]()</code></li>
<li>访问属性：<code>o4[i]</code></li>
</ul>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="title">for</span>(<span class="params"><span class="keyword">var</span> i <span class="keyword">in</span> o4</span>)</span>&#123;</span><br><span class="line">   <span class="built_in">console</span>.log(<span class="keyword">typeof</span>(o4[i]));  </span><br><span class="line">   <span class="function"><span class="title">if</span>(<span class="params"><span class="keyword">typeof</span>(o4[i])==<span class="string">&quot;function&quot;</span></span>)</span>&#123;</span><br><span class="line">       o4[i]();  <span class="comment">//访问方法</span></span><br><span class="line">    &#125;<span class="keyword">else</span>&#123;</span><br><span class="line">       <span class="built_in">console</span>.log(o4[i]);  <span class="comment">//访问属性</span></span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;!DOCTYPE <span class="meta-keyword">html</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">html</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">title</span>&gt;</span>动态增加对象成员<span class="tag">&lt;/<span class="name">title</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line">   <span class="tag">&lt;<span class="name">form</span>&gt;</span></span><br><span class="line">      <span class="tag">&lt;<span class="name">input</span> <span class="attr">id</span>=<span class="string">&quot;key&quot;</span> <span class="attr">type</span>=<span class="string">&quot;text&quot;</span> <span class="attr">value</span>=<span class="string">&quot;name&quot;</span>&gt;</span></span><br><span class="line">      <span class="tag">&lt;<span class="name">input</span> <span class="attr">id</span>=<span class="string">&quot;val&quot;</span> <span class="attr">type</span>=<span class="string">&quot;text&quot;</span> <span class="attr">value</span>=<span class="string">&quot;Jack&quot;</span>&gt;</span></span><br><span class="line">      <span class="tag">&lt;<span class="name">input</span> <span class="attr">id</span>=<span class="string">&quot;btn&quot;</span> <span class="attr">type</span>=<span class="string">&quot;button&quot;</span> <span class="attr">value</span>=<span class="string">&quot;测试&quot;</span>&gt;</span></span><br><span class="line">   <span class="tag">&lt;/<span class="name">form</span>&gt;</span></span><br><span class="line">   <span class="tag">&lt;<span class="name">script</span>&gt;</span></span><br><span class="line"><span class="javascript">      <span class="keyword">var</span> k = <span class="built_in">document</span>.getElementById(<span class="string">&#x27;key&#x27;</span>);</span></span><br><span class="line"><span class="javascript">      <span class="keyword">var</span> v = <span class="built_in">document</span>.getElementById(<span class="string">&#x27;val&#x27;</span>);</span></span><br><span class="line"><span class="javascript">      <span class="keyword">var</span> btn = <span class="built_in">document</span>.getElementById(<span class="string">&#x27;btn&#x27;</span>);</span></span><br><span class="line"><span class="javascript">      <span class="keyword">var</span> o = &#123;&#125;;  <span class="comment">//创建空对象</span></span></span><br><span class="line"><span class="javascript">      btn.onclick = <span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;  <span class="comment">//当点击btn时，调用匿名函数</span></span></span><br><span class="line"><span class="javascript">         o[k.value] = v.value;  <span class="comment">//增加属性，k的value为键、v的value为值</span></span></span><br><span class="line"><span class="javascript">         <span class="built_in">console</span>.log(o);  <span class="comment">//打印对象</span></span></span><br><span class="line">     &#125;</span><br><span class="line">   <span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">body</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">html</span>&gt;</span></span><br></pre></td></tr></table></figure>

<img src="https://cdn.jsdelivr.net/gh/lzyblog/image@main/2020/12/21/6d0f7bf592c5985c9fce00bb75d2b2d7.png" width="50%">

<h2 id="深拷贝与浅拷贝"><a href="#深拷贝与浅拷贝" class="headerlink" title="深拷贝与浅拷贝"></a>深拷贝与浅拷贝</h2><ul>
<li>浅拷贝—复制快捷方式</li>
</ul>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> o1 = &#123;<span class="attr">name</span>: <span class="string">&#x27;Jim&#x27;</span>, <span class="attr">age</span>: <span class="number">19</span>, <span class="attr">gender</span>: <span class="string">&#x27;男&#x27;</span>&#125;;</span><br><span class="line"><span class="keyword">var</span> o2=o1;</span><br></pre></td></tr></table></figure>
<ul>
<li>深拷贝—复制文件本身</li>
</ul>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">deepCopy</span>(<span class="params">obj</span>)</span>&#123;</span><br><span class="line">   <span class="keyword">var</span> o = &#123;&#125;;</span><br><span class="line">   <span class="function"><span class="title">for</span>(<span class="params"><span class="keyword">var</span> k <span class="keyword">in</span> obj</span>)</span>&#123;     <span class="comment">//假设k是简单的成员（不是对象）</span></span><br><span class="line">   o[k] = obj[k];</span><br><span class="line">   &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h2 id="this指向"><a href="#this指向" class="headerlink" title="this指向"></a>this指向</h2><ul>
<li> 使用<code>new</code>调用构造函数时，<code>this</code>指向新创建的对象</li>
</ul>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">function</span>  <span class="title">Person</span>(<span class="params">name,age</span>)</span>&#123;</span><br><span class="line">   <span class="built_in">this</span>.name = name;</span><br><span class="line">   <span class="built_in">this</span>.age = age;</span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">var</span> o1 = <span class="keyword">new</span> Person(“Jack”,<span class="number">18</span>);</span><br><span class="line"><span class="keyword">var</span> o2 = <span class="keyword">new</span> Person(“Lily”,<span class="number">20</span>);</span><br></pre></td></tr></table></figure>

<ul>
<li>将函数作为对象的方法调用，this指向该对象</li>
</ul>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> obj = &#123;</span><br><span class="line">   name:”Jack”,</span><br><span class="line">   age:<span class="number">19</span>,</span><br><span class="line">   sayHello:<span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">      <span class="built_in">console</span>.log( <span class="built_in">this</span>.name + “,” + <span class="built_in">this</span>.age);</span><br><span class="line">   &#125;</span><br><span class="line">&#125;;</span><br><span class="line">obj.sayHello();</span><br></pre></td></tr></table></figure>

<ul>
<li> 直接通过函数名调用函数，<code>this</code>指向全局对象<code>window</code></li>
</ul>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">foo</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">	<span class="keyword">return</span> <span class="built_in">this</span>;</span><br><span class="line">&#125;</span><br><span class="line"><span class="built_in">console</span>.log(foo()===<span class="built_in">window</span>); <span class="comment">//true</span></span><br></pre></td></tr></table></figure>

<h1 id="内置对象"><a href="#内置对象" class="headerlink" title="内置对象"></a>内置对象</h1><h2 id="String对象"><a href="#String对象" class="headerlink" title="String对象"></a>String对象</h2><table>
<thead>
<tr>
<th align="center">成员</th>
<th align="center">作用</th>
</tr>
</thead>
<tbody><tr>
<td align="center"><code>length</code></td>
<td align="center">获取字符串长度</td>
</tr>
<tr>
<td align="center"><code>charAt(index)</code></td>
<td align="center">获取index位置的字符，位置从0开始</td>
</tr>
<tr>
<td align="center"><code>indexOf(searchValue)</code></td>
<td align="center">获取seerchValue在字符串中首次出现的位置</td>
</tr>
<tr>
<td align="center"><code>lastIndexOf(searchValue)</code></td>
<td align="center">获取seerchValue在字符串中最后出现的位置</td>
</tr>
<tr>
<td align="center"><code>substring(start[,end])</code></td>
<td align="center">截取从start位置到end位置之间的一个子字符串</td>
</tr>
<tr>
<td align="center"><code>substr(start[,length])</code></td>
<td align="center">截取从start位置开始到length长度的子字符串</td>
</tr>
<tr>
<td align="center"><code>toLowerCase()</code></td>
<td align="center">获取字符串的小写形式</td>
</tr>
<tr>
<td align="center"><code>toUpperCase()</code></td>
<td align="center">获取字符串的大写形式</td>
</tr>
<tr>
<td align="center"><code>split([separator[,limit])</code></td>
<td align="center">使用separator分隔符将字符串分隔成数组，limit用于限制数量</td>
</tr>
<tr>
<td align="center"><code>replace(str1,str2)</code></td>
<td align="center">使用str2替换字符串中的str1，返回替换结果</td>
</tr>
</tbody></table>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> name=<span class="string">&#x27;Administrator&#x27;</span>;</span><br><span class="line"><span class="function"><span class="title">if</span>(<span class="params">name.length&lt;<span class="number">3</span>||name.length&gt;<span class="number">10</span></span>)</span>&#123;</span><br><span class="line">   alert(<span class="string">&#x27;用户名必须在3~10之间&#x27;</span>);</span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">if</span>(name.toLowerCase().indexOf(<span class="string">&#x27;admini&#x27;</span>)!== -<span class="number">1</span>)&#123; <span class="comment">//indexOf查找失败返回-1</span></span><br><span class="line">   alert(<span class="string">&#x27;用户名中不能包含敏感词：admin&#x27;</span>);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h2 id="Number对象"><a href="#Number对象" class="headerlink" title="Number对象"></a>Number对象</h2><ul>
<li><code>Number</code>对象用于处理整数、浮点数等数值，常用的属性和方法如下。</li>
</ul>
<table>
<thead>
<tr>
<th align="center">成员</th>
<th align="center">作用</th>
</tr>
</thead>
<tbody><tr>
<td align="center"><code>MAX_VALUE</code></td>
<td align="center">在JavaScript中所能表示的最大数值（静态成员）</td>
</tr>
<tr>
<td align="center"><code>MIN_VALUE</code></td>
<td align="center">在JavaScript中所能表示的最小正值（静态成员）</td>
</tr>
<tr>
<td align="center"><code>toFixed(digits)</code></td>
<td align="center">使用定点表示法来格式化一个数值</td>
</tr>
</tbody></table>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> num=<span class="number">12345.6789</span>;</span><br><span class="line">num.toFixed();  <span class="comment">//四舍五入，不包括小数部分，返回结果：12345</span></span><br><span class="line">num.toFixed(<span class="number">1</span>); <span class="comment">//四舍五入，保留1位小数，返回结果：12345.7</span></span><br><span class="line">num.toFixed(<span class="number">6</span>); <span class="comment">//用0填充不足的小数位，返回结果：12345.678900</span></span><br><span class="line">num.MAX_VALUE;</span><br><span class="line">num.MIN_VALUE;</span><br></pre></td></tr></table></figure>
<h2 id="Math对象"><a href="#Math对象" class="headerlink" title="Math对象"></a>Math对象</h2><ul>
<li><code>Math</code>对象用于对数值进行数学运算。</li>
</ul>
<table>
<thead>
<tr>
<th align="center">成员</th>
<th align="center">作用</th>
</tr>
</thead>
<tbody><tr>
<td align="center"><code>PI</code></td>
<td align="center">获取圆周率，结果为3.141592653589793</td>
</tr>
<tr>
<td align="center"><code>abs(x)</code></td>
<td align="center">获取x的绝对值，可传入普通数值或是用字符串表示的数值</td>
</tr>
<tr>
<td align="center"><code>pow(base,xponent)</code></td>
<td align="center">获取基数(base)的指数(exponent)次幂，即baseexponnet</td>
</tr>
<tr>
<td align="center"><code>sqrt(x)</code></td>
<td align="center">获取x的平方根</td>
</tr>
<tr>
<td align="center"><code>ceil(x)</code></td>
<td align="center">获取大于或等于x的最小整数，即向上取整</td>
</tr>
<tr>
<td align="center"><code>floor(x)</code></td>
<td align="center">获取小于或等于x的最大整数，即向下取整</td>
</tr>
<tr>
<td align="center"><code>round(x)</code></td>
<td align="center">获取x的四舍五入后的整数值</td>
</tr>
<tr>
<td align="center"><code>random()</code></td>
<td align="center">获取大于或等于0.0且小于1.0的随机值</td>
</tr>
</tbody></table>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> num=<span class="number">10.88</span>;</span><br><span class="line"><span class="built_in">Math</span>.ceil(num);</span><br><span class="line"><span class="built_in">Math</span>.random();</span><br><span class="line"><span class="comment">//Math.floor( Math.random() * (max-min+1) + min)，生成[min,max]的随机整数。</span></span><br><span class="line"><span class="built_in">Math</span>.random()*(<span class="number">3</span>-<span class="number">1</span>+<span class="number">1</span>)+<span class="number">1</span>; <span class="comment">//[1,3]  //Math.random()*(Max-Min+1)+Min</span></span><br><span class="line"><span class="built_in">Math</span>.random()*(<span class="number">99</span>-<span class="number">88</span>)+<span class="number">88</span>; <span class="comment">//[88,99) //Math.random()*(Max-Min)+Min</span></span><br></pre></td></tr></table></figure>


<h2 id="Date对象"><a href="#Date对象" class="headerlink" title="Date对象"></a>Date对象</h2><ul>
<li><code>Date</code>对象用于处理日期和时间。</li>
</ul>
<table>
<thead>
<tr>
<th align="center">成员</th>
<th align="center">作用</th>
</tr>
</thead>
<tbody><tr>
<td align="center"><code>getFullYear()</code></td>
<td align="center">获取表示年份的4位数字，如2020</td>
</tr>
<tr>
<td align="center"><code>setFullYear(value)</code></td>
<td align="center">设置年份</td>
</tr>
<tr>
<td align="center"><code>getMonth()</code></td>
<td align="center"><strong>获取月份，范围0~11（0表示一月，1表示二月，依次类推）</strong></td>
</tr>
<tr>
<td align="center"><code>setMonth(value)</code></td>
<td align="center">设置月份</td>
</tr>
<tr>
<td align="center"><code>getDate()</code></td>
<td align="center"><strong>获取月份中的某一天，范围1~31</strong></td>
</tr>
<tr>
<td align="center"><code>setDate(value)</code></td>
<td align="center">设置月份中的某一天</td>
</tr>
<tr>
<td align="center"><code>getDay()</code></td>
<td align="center"><strong>获取星期，范围0~6（0表示星期日，1表示星期一，依次类推</strong>）</td>
</tr>
<tr>
<td align="center"><code>getHours()</code></td>
<td align="center">获取小时数，返回0~23</td>
</tr>
<tr>
<td align="center"><code>setHours(value)</code></td>
<td align="center">设置小时数</td>
</tr>
<tr>
<td align="center"><code>getMinutes()</code></td>
<td align="center">获取分钟数，范围0~59</td>
</tr>
<tr>
<td align="center"><code>setMinutes(value)</code></td>
<td align="center">设置分钟数</td>
</tr>
<tr>
<td align="center"><code> getSeconds()</code></td>
<td align="center">获取秒数，范围0~59</td>
</tr>
<tr>
<td align="center"><code>setSeconds(value)</code></td>
<td align="center">设置秒数</td>
</tr>
<tr>
<td align="center"><code>getMilliseconds() </code></td>
<td align="center">获取毫秒数，范围0~999</td>
</tr>
<tr>
<td align="center"><code>getMilliseconds(value)</code></td>
<td align="center">设置毫秒数</td>
</tr>
<tr>
<td align="center"><code>getTime() </code></td>
<td align="center">获取从1970-01-01 00:00:00 距离Date对象所代表时间</td>
</tr>
</tbody></table>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> date=<span class="keyword">new</span> <span class="built_in">Date</span>();</span><br><span class="line"><span class="built_in">document</span>.write(date+<span class="string">&quot;&lt;br&gt;&quot;</span>);</span><br><span class="line"><span class="built_in">console</span>.log(<span class="string">&quot;年：&quot;</span>+date.getYear());  <span class="comment">//年：120</span></span><br><span class="line"><span class="built_in">console</span>.log(<span class="string">&quot;年：&quot;</span>+date.getFullYear());  <span class="comment">//年：2020</span></span><br><span class="line"><span class="built_in">console</span>.log(<span class="string">&quot;月：&quot;</span>+date.getMonth());  <span class="comment">//月：9</span></span><br><span class="line"><span class="built_in">console</span>.log(<span class="string">&quot;日：&quot;</span>+date.getDate());  <span class="comment">//日：15</span></span><br><span class="line"><span class="built_in">console</span>.log(<span class="string">&quot;时：&quot;</span>+date.getHours());  <span class="comment">//时：8</span></span><br><span class="line"><span class="built_in">console</span>.log(<span class="string">&quot;分：&quot;</span>+date.getMinutes());  <span class="comment">//分：52</span></span><br><span class="line"><span class="built_in">console</span>.log(<span class="string">&quot;秒：&quot;</span>+date.getSeconds());  <span class="comment">//秒：54</span></span><br><span class="line"><span class="built_in">console</span>.log(<span class="string">&quot;周几：&quot;</span>+date.getDay());  <span class="comment">//周几：4</span></span><br></pre></td></tr></table></figure>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;!DOCTYPE <span class="meta-keyword">html</span> <span class="meta-keyword">PUBLIC</span> <span class="meta-string">&quot;-//W3C//DTD XHTML 1.0 Transitional//EN&quot;</span> <span class="meta-string">&quot;http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd&quot;</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">html</span> <span class="attr">xmlns</span>=<span class="string">&quot;http://www.w3.org/1999/xhtml&quot;</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">meta</span> <span class="attr">http-equiv</span>=<span class="string">&quot;Content-Type&quot;</span> <span class="attr">content</span>=<span class="string">&quot;text/html; charset=utf-8&quot;</span> /&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">title</span>&gt;</span>制作年历<span class="tag">&lt;/<span class="name">title</span>&gt;</span></span><br><span class="line">   <span class="tag">&lt;<span class="name">style</span> <span class="attr">type</span>=<span class="string">&quot;text/css&quot;</span>&gt;</span></span><br><span class="line">      body&#123;</span><br><span class="line"><span class="css">         <span class="selector-tag">text-align</span><span class="selector-pseudo">:center</span>;</span></span><br><span class="line">      &#125;</span><br><span class="line"><span class="css">      <span class="selector-class">.box</span>&#123;</span></span><br><span class="line"><span class="css">         <span class="selector-tag">margin</span><span class="selector-pseudo">:0</span> <span class="selector-tag">auto</span>;</span></span><br><span class="line"><span class="css">         <span class="selector-tag">width</span><span class="selector-pseudo">:880px</span>;</span></span><br><span class="line">      &#125;</span><br><span class="line"><span class="css">      <span class="selector-class">.title</span>&#123;</span></span><br><span class="line"><span class="css">         <span class="selector-tag">background</span>:<span class="selector-id">#ccc</span>;</span></span><br><span class="line">      &#125;</span><br><span class="line">      table&#123;</span><br><span class="line"><span class="css">         <span class="selector-tag">height</span><span class="selector-pseudo">:200px</span>;</span></span><br><span class="line"><span class="css">         <span class="selector-tag">width</span><span class="selector-pseudo">:200px</span>;</span></span><br><span class="line"><span class="css">         <span class="selector-tag">font-size</span><span class="selector-pseudo">:12px</span>;</span></span><br><span class="line"><span class="css">         <span class="selector-tag">text-align</span><span class="selector-pseudo">:center</span>;</span></span><br><span class="line"><span class="css">         <span class="selector-tag">float</span><span class="selector-pseudo">:left</span>;   <span class="comment">/*浮动属性，脱离文档流，向左移动，直至遇到父元素或另一个浮动元素的边缘*/</span></span></span><br><span class="line"><span class="css">         <span class="selector-tag">margin</span><span class="selector-pseudo">:10px</span>;</span></span><br><span class="line"><span class="css">         <span class="selector-tag">font-family</span><span class="selector-pseudo">:Arial</span>;</span></span><br><span class="line">      &#125;</span><br><span class="line">   <span class="tag">&lt;/<span class="name">style</span>&gt;</span></span><br><span class="line">   <span class="tag">&lt;<span class="name">script</span> <span class="attr">type</span>=<span class="string">&quot;text/javascript&quot;</span>&gt;</span></span><br><span class="line"><span class="javascript">      <span class="comment">/*定义年历生成函数*/</span></span></span><br><span class="line"><span class="javascript">      <span class="function"><span class="keyword">function</span> <span class="title">calendar</span>(<span class="params">y</span>)</span>&#123;  <span class="comment">//y：从网页获取到的年份</span></span></span><br><span class="line"><span class="javascript">         <span class="comment">//获取指定年份1月1日的星期数值</span></span></span><br><span class="line"><span class="javascript">         <span class="keyword">var</span> w = <span class="keyword">new</span> <span class="built_in">Date</span>(y,<span class="number">0</span>).getDay();	  </span></span><br><span class="line"><span class="javascript"><span class="comment">//Date创建方式1： var date1 = new Date(2017,9,1,11,53,4);年月日时分秒，至少给出年和月；另外月的范围是0~11，即参数为0，实际月份为1月；</span></span></span><br><span class="line"><span class="javascript"><span class="comment">//Date创建方式2： var date2 = new Date(&#x27;2017-10-01 11:53:04&#x27;);	//getDay() 获取星期，范围0~6</span></span></span><br><span class="line"><span class="javascript">         <span class="keyword">var</span> html=<span class="string">&#x27;&lt;div class=&quot;box&quot;&gt;&#x27;</span>;</span></span><br><span class="line">         </span><br><span class="line"><span class="javascript">         <span class="comment">//拼接每个月份的表格</span></span></span><br><span class="line"><span class="javascript">         <span class="function"><span class="title">for</span>(<span class="params"><span class="keyword">var</span> m=<span class="number">1</span>;m&lt;=<span class="number">12</span>;m++</span>)</span>&#123;</span></span><br><span class="line"><span class="javascript">            html += <span class="string">&#x27;&lt;table&gt;&#x27;</span>;</span></span><br><span class="line"><span class="handlebars"><span class="xml">            html += &#x27;<span class="tag">&lt;<span class="name">tr</span> <span class="attr">class</span>=<span class="string">&quot;title&quot;</span>&gt;</span><span class="tag">&lt;<span class="name">th</span> <span class="attr">colspan</span>=<span class="string">&quot;7&quot;</span>&gt;</span>&#x27; + y + &#x27; 年 &#x27; + m + &#x27; 月<span class="tag">&lt;/<span class="name">th</span>&gt;</span><span class="tag">&lt;/<span class="name">tr</span>&gt;</span>&#x27;;</span></span></span><br><span class="line"><span class="handlebars"><span class="xml">            html += &#x27;<span class="tag">&lt;<span class="name">tr</span>&gt;</span><span class="tag">&lt;<span class="name">td</span>&gt;</span>日<span class="tag">&lt;/<span class="name">td</span>&gt;</span><span class="tag">&lt;<span class="name">td</span>&gt;</span>一<span class="tag">&lt;/<span class="name">td</span>&gt;</span><span class="tag">&lt;<span class="name">td</span>&gt;</span>二<span class="tag">&lt;/<span class="name">td</span>&gt;</span><span class="tag">&lt;<span class="name">td</span>&gt;</span>三<span class="tag">&lt;/<span class="name">td</span>&gt;</span><span class="tag">&lt;<span class="name">td</span>&gt;</span>四<span class="tag">&lt;/<span class="name">td</span>&gt;</span><span class="tag">&lt;<span class="name">td</span>&gt;</span>五<span class="tag">&lt;/<span class="name">td</span>&gt;</span><span class="tag">&lt;<span class="name">td</span>&gt;</span>六<span class="tag">&lt;/<span class="name">td</span>&gt;</span><span class="tag">&lt;/<span class="name">tr</span>&gt;</span>&#x27;;</span></span></span><br><span class="line">			</span><br><span class="line"><span class="javascript">            <span class="comment">//获取月份m共有多少天？</span></span></span><br><span class="line"><span class="javascript">            <span class="keyword">var</span> max = (<span class="keyword">new</span> <span class="built_in">Date</span>(y,m,<span class="number">0</span>)).getDate();   <span class="comment">//getDate获取月份中的某一天，范围1~31；当日为0时，可获得该月的天数。</span></span></span><br><span class="line"><span class="javascript">            <span class="comment">//开始tr标签</span></span></span><br><span class="line"><span class="javascript">            html = html+<span class="string">&#x27;&lt;tr&gt;&#x27;</span>;</span></span><br><span class="line"><span class="javascript">            <span class="function"><span class="title">for</span>(<span class="params"><span class="keyword">var</span> d=<span class="number">1</span>;d&lt;=max;d++</span>)</span>&#123;</span></span><br><span class="line"><span class="javascript">            <span class="keyword">if</span>((w!=<span class="number">0</span>) &amp;&amp; (d==<span class="number">1</span>))&#123;  <span class="comment">//如果该月的第一天不是星期日，则填充空白</span></span></span><br><span class="line"><span class="handlebars"><span class="xml">               html = html+&#x27;<span class="tag">&lt;<span class="name">td</span> <span class="attr">colspan</span>=<span class="string">&quot;&#x27; + w + &#x27;&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">td</span>&gt;</span>&#x27;;  </span></span></span><br><span class="line">            &#125;				</span><br><span class="line"><span class="javascript">            html = html + <span class="string">&#x27;&lt;td&gt;&#x27;</span> + d + <span class="string">&#x27;&lt;/td&gt;&#x27;</span>;</span></span><br><span class="line"><span class="javascript">            <span class="function"><span class="title">if</span>(<span class="params">w==<span class="number">6</span> &amp;&amp; d!=max</span>)</span>&#123;  <span class="comment">//如果星期六不是该月的最后一天，则换行	 </span></span></span><br><span class="line"><span class="handlebars"><span class="xml">               html = html + &#x27;<span class="tag">&lt;/<span class="name">tr</span>&gt;</span><span class="tag">&lt;<span class="name">tr</span>&gt;</span>&#x27;;</span></span></span><br><span class="line"><span class="javascript">            &#125;<span class="keyword">else</span> <span class="function"><span class="title">if</span>(<span class="params">d==max</span>)</span>&#123;   <span class="comment">//该月的最后一天，闭合&lt;tr&gt;标签</span></span></span><br><span class="line"><span class="javascript">               html = html + <span class="string">&#x27;&lt;/tr&gt;&#x27;</span>;</span></span><br><span class="line">            &#125;</span><br><span class="line">               w = (w+1&gt;6)?0:w+1;</span><br><span class="line">            &#125;</span><br><span class="line"><span class="javascript">            html = html + <span class="string">&#x27;&lt;/table&gt;&#x27;</span>;</span></span><br><span class="line">      &#125;</span><br><span class="line"><span class="javascript">      html = html + <span class="string">&#x27;&lt;/div&gt;&#x27;</span>;</span></span><br><span class="line"><span class="javascript">      <span class="keyword">return</span> html;</span></span><br><span class="line">      &#125;</span><br><span class="line">   <span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line">   <span class="tag">&lt;<span class="name">script</span> <span class="attr">type</span>=<span class="string">&quot;text/javascript&quot;</span>&gt;</span></span><br><span class="line"><span class="javascript">      <span class="keyword">var</span> year = <span class="built_in">parseInt</span>(prompt(<span class="string">&#x27;输入年份:&#x27;</span>,<span class="string">&#x27;2019&#x27;</span>));</span></span><br><span class="line"><span class="javascript">      <span class="built_in">document</span>.write(calendar(year));   </span></span><br><span class="line">   <span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">body</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">html</span>&gt;</span></span><br></pre></td></tr></table></figure>
<p><img src="https://cdn.jsdelivr.net/gh/lzyblog/image@main/2020/12/22/5a45bff2253fc06cc1a9d9c7ee84bfff.png"></p>
<h1 id="JSON"><a href="#JSON" class="headerlink" title="JSON"></a>JSON</h1><ul>
<li><p>JSON: <strong>JavaScript Object Notation</strong>(JavaScript 对象表示法)。</p>
</li>
<li><p>JSON 是<strong>轻量级的文本数据交换格式</strong>，类似 XML，但 比 XML 更小、更快，更易解析。</p>
</li>
<li><p>JSON 独立于语言和平台，目前非常多的动态（PHP，JSP，.NET）编程语言都支持JSON。</p>
</li>
</ul>
<h2 id="JSON对象"><a href="#JSON对象" class="headerlink" title="JSON对象"></a>JSON对象</h2><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//JSON对象</span></span><br><span class="line"><span class="keyword">var</span> obj = &#123;“name”:“Jerry”，“age”:<span class="number">15</span>&#125; </span><br><span class="line"><span class="comment">//JS对象</span></span><br><span class="line"><span class="keyword">var</span> obj = &#123;<span class="attr">name</span>:“Jerry”，age:<span class="number">15</span>，    </span><br><span class="line">   sayHello:<span class="function"><span class="keyword">function</span></span>&#123;……&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<ul>
<li><p>JSON对象的属性名（key）必须被包含在双引号之中，而JavaScript对象除了有空格的属性名、中间有连字符-的属性名必须在双引号之中外，其它随意；</p>
</li>
<li><p>不能在JSON对象中定义方法，而在JavaScript对象中可以；</p>
</li>
<li><p>JSON对象可以被很多语言操作，而JavaScript对象只有JS自己可以识别。</p>
</li>
</ul>
<h2 id="JSON数组"><a href="#JSON数组" class="headerlink" title="JSON数组"></a>JSON数组</h2><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> myJson =&#123;</span><br><span class="line">   <span class="string">&quot;country&quot;</span>:<span class="string">&quot;China&quot;</span>,</span><br><span class="line">   <span class="string">&quot;population&quot;</span>:<span class="string">&quot;1.3billion&quot;</span>,</span><br><span class="line">      <span class="string">&quot;bigCity&quot;</span>:[<span class="string">&quot;Peking&quot;</span>,<span class="string">&quot;Shanghai&quot;</span>,<span class="string">&quot;ShenZhen&quot;</span>,<span class="string">&quot;HongKong&quot;</span>]</span><br><span class="line">   &#125;</span><br><span class="line">   myJson .bigCity[<span class="number">0</span>] = <span class="string">&quot;GuangZhou&quot;</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta">文章作者: </span><span class="post-copyright-info"><a href="mailto:undefined">小李博客</a></span></div><div class="post-copyright__type"><span class="post-copyright-meta">文章链接: </span><span class="post-copyright-info"><a href="https://xiaoliblog.cn">https://xiaoliblog.cn</a></span></div><div class="post-copyright__notice"><span class="post-copyright-meta">版权声明: </span><span class="post-copyright-info">本博客所有文章除特别声明外，均采用 <a href="https://creativecommons.org/licenses/by-nc-sa/4.0/" target="_blank">CC BY-NC-SA 4.0</a> 许可协议。转载请注明来自 <a href="http://xiaoliblog.cn" target="_blank">小李博客</a>！</span></div></div><div class="tag_share"><div class="post-meta__tag-list"><a class="post-meta__tags" href="/tags/JavaScript/">JavaScript</a></div><div class="post_share"><div class="social-share" data-image="https://cdn.jsdelivr.net/gh/lzyblog/image@main/2020/12/26/527e6ac3b16d4038ba3bd09e3b174450.png" data-sites="facebook,twitter,wechat,weibo,qq"></div><link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/social-share.js/dist/css/share.min.css" media="print" onload="this.media='all'"><script src="https://cdn.jsdelivr.net/npm/social-share.js/dist/js/social-share.min.js" defer></script></div></div><div class="post-reward"><div class="reward-button button--animated"><i class="fas fa-qrcode"></i> 打赏</div><div class="reward-main"><ul class="reward-all"><li class="reward-item"><a href="/img/wechat.png" target="_blank"><img class="post-qr-code-img" src="/img/wechat.png" alt="微信"/></a><div class="post-qr-code-desc">微信</div></li><li class="reward-item"><a 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toc-level-1"><a class="toc-link" href="#%E5%AF%B9%E8%B1%A1"><span class="toc-number">1.</span> <span class="toc-text">对象</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#%E8%87%AA%E5%AE%9A%E4%B9%89%E5%AF%B9%E8%B1%A1"><span class="toc-number">1.1.</span> <span class="toc-text">自定义对象</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#%E5%AD%97%E9%9D%A2%E9%87%8F-%E5%88%9B%E5%BB%BA%E5%AF%B9%E8%B1%A1"><span class="toc-number">1.1.1.</span> <span class="toc-text">字面量{}创建对象</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E8%AE%BF%E9%97%AE%E5%AF%B9%E8%B1%A1%E6%88%90%E5%91%98"><span class="toc-number">1.1.2.</span> <span class="toc-text">访问对象成员</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E5%A2%9E%E5%8A%A0%E5%AF%B9%E8%B1%A1%E6%88%90%E5%91%98"><span class="toc-number">1.1.3.</span> <span class="toc-text">增加对象成员</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E5%8F%AF%E5%8F%98%E6%88%90%E5%91%98%E5%90%8D"><span class="toc-number">1.1.4.</span> <span class="toc-text">可变成员名</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E5%AF%B9%E8%B1%A1%E6%88%90%E5%91%98%E9%81%8D%E5%8E%86"><span class="toc-number">1.1.5.</span> <span class="toc-text">对象成员遍历</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E6%B7%B1%E6%8B%B7%E8%B4%9D%E4%B8%8E%E6%B5%85%E6%8B%B7%E8%B4%9D"><span class="toc-number">1.2.</span> <span class="toc-text">深拷贝与浅拷贝</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#this%E6%8C%87%E5%90%91"><span class="toc-number">1.3.</span> <span class="toc-text">this指向</span></a></li></ol></li><li class="toc-item toc-level-1"><a class="toc-link" href="#%E5%86%85%E7%BD%AE%E5%AF%B9%E8%B1%A1"><span class="toc-number">2.</span> <span class="toc-text">内置对象</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#String%E5%AF%B9%E8%B1%A1"><span class="toc-number">2.1.</span> <span class="toc-text">String对象</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#Number%E5%AF%B9%E8%B1%A1"><span class="toc-number">2.2.</span> <span class="toc-text">Number对象</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#Math%E5%AF%B9%E8%B1%A1"><span class="toc-number">2.3.</span> <span class="toc-text">Math对象</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#Date%E5%AF%B9%E8%B1%A1"><span class="toc-number">2.4.</span> <span class="toc-text">Date对象</span></a></li></ol></li><li class="toc-item toc-level-1"><a class="toc-link" href="#JSON"><span class="toc-number">3.</span> <span class="toc-text">JSON</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#JSON%E5%AF%B9%E8%B1%A1"><span class="toc-number">3.1.</span> <span class="toc-text">JSON对象</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#JSON%E6%95%B0%E7%BB%84"><span class="toc-number">3.2.</span> <span class="toc-text">JSON数组</span></a></li></ol></li></ol></div></div><div class="card-widget card-recent-post"><div class="item-headline"><i class="fas fa-history"></i><span>最新文章</span></div><div class="aside-list"><div class="aside-list-item"><a class="thumbnail" href="/page/project01.html" title="前端实例🥳响应式网站首页"><img src="https://cdn.jsdelivr.net/gh/xiaoliblog/image@c19917500ab083c77c7613263ba7ee74d5a08ae6/2021/04/30/469f30b141d73fa0fc4c962662d5813f.png" onerror="this.onerror=null;this.src='https://cdn.jsdelivr.net/gh/lzyblog/image@main/2020/11/19/bd16b394f7359083b1f6072a67e3f968.png'" alt="前端实例🥳响应式网站首页"/></a><div class="content"><a class="title" href="/page/project01.html" title="前端实例🥳响应式网站首页">前端实例🥳响应式网站首页</a><time datetime="2021-04-30T11:50:53.094Z" title="发表于 2021-04-30 19:50:53">2021-04-30</time></div></div><div class="aside-list-item"><a class="thumbnail" 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    else loadTwikoo(true)
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    window.loadOtherComment = () => {
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})()</script></div><script defer src="//lib.baomitu.com/jquery/3.5.1/jquery.min.js"></script><script defer src="https://myhkw.cn/api/player/160561664166" id="myhk" key="160561664166" m="1"></script><div><canvas id="snow" style="position:fixed;top:0;left:0;width:100%;height:100%;z-index:99999;pointer-events:none"></canvas></div><script>const notMobile = (!(navigator.userAgent.match(/(phone|pad|pod|iPhone|iPod|ios|iPad|Android|Mobile|BlackBerry|IEMobile|MQQBrowser|JUC|Fennec|wOSBrowser|BrowserNG|WebOS|Symbian|Windows Phone)/i)));</script><scrip async type="text/javascript" src="https://cdn.jsdelivr.net/gh/Candinya/Kratos-Rebirth@latest/source/js/snow.min.js"></scrip><scrip defer src="https://cdn.jsdelivr.net/npm/hexo-theme-volantis@latest/source/js/issues.min.js"></scrip><script async data-pjax src="//busuanzi.ibruce.info/busuanzi/2.3/busuanzi.pure.mini.js"></script><script>var gitcalendar = new Vue({
  el: '#gitcalendar',
  data: {
    simplemode: true, 
    user: 'xiaoliblog',
    fixed: 'fixed',
    px: 'px',
    x: '',
    y: '',
    span1: '',
    span2: '',
    month: ['一月', '二月', '三月', '四月', '五月', '六月', '七月', '八月', '九月', '十月', '十一月', '十二月'],
    monthchange: [],
    oneyearbeforeday: '',
    thisday: '',
    amonthago: '',
    aweekago: '',
    weekdatacore: 0,
    datacore: 0,
    total: 0,
    datadate: '',
    data: [],
    positionplusdata: [],
    firstweek: [],
    lastweek: [],
    beforeweek: [],
    thisweekdatacore: 0,
    mounthbeforeday: 0,
    mounthfirstindex: 0,
    crispedges: 'crispedges',
    thisdayindex: 0,
    amonthagoindex: 0,
    amonthagoweek: [],
    firstdate: [],
    first2date: [],
    montharrbefore: [],
    monthindex: 0,
    color: ['#ebedf0', '#f1f8ff', '#dbedff', '#c8e1ff', '#79b8ff', '#2188ff', '#0366d6', '#005cc5', '#044289', '#032f62', '#05264c']
  },
  methods: {
    selectStyle(data, event) {
      document.querySelector('.angle-wrapper').style.display = 'block'
      this.span1 = data.date;
      this.span2 = data.count;
      this.x = event.clientX - 100;
      this.y = event.clientY - 60
    },
    outStyle() {
      document.querySelector('.angle-wrapper').style.display = 'none'
    },
    thiscolor(x) {
      if (x === 0) {
        let i = parseInt(x / 2);
        return this.color[0]
      } else if (x < 2) {
        return this.color[1]
      } else if (x < 20) {
        let i = parseInt(x / 2);
        return this.color[i]
      } else {
        return this.color[9]
      }
    },
  }
});
var apiurl = 'python-github-calendar-api-ruby.vercel.app' ? 'https://python-github-calendar-api-ruby.vercel.app/api?' : 'https://githubapi.ryanchristian.dev/user/'
var githubapiurl = apiurl + gitcalendar.user;
//canvas绘图
function responsiveChart() {
  let c = document.getElementById("gitcanvas");
  if (c) {
    let cmessage = document.getElementById("gitmessage");
    let ctx = c.getContext("2d");
    c.width = document.getElementById("gitcalendarcanvasbox").offsetWidth;
    let linemaxwitdh = 0.96 * c.width / gitcalendar.data.length;
    c.height = 9 * linemaxwitdh;
    let lineminwitdh = 0.8 * linemaxwitdh;
    let setposition = {
      x: 0.02 * c.width,
      y: 0.025 * c.width
    };
    for (let week in gitcalendar.data) {
      weekdata = gitcalendar.data[week];
      for (let day in weekdata) {
        let dataitem = {
          date: "",
          count: "",
          x: 0,
          y: 0
        };
        gitcalendar.positionplusdata.push(dataitem);
        ctx.fillStyle = gitcalendar.thiscolor(weekdata[day].count);
        setposition.y = Math.round(setposition.y * 100) / 100;
        dataitem.date = weekdata[day].date;
        dataitem.count = weekdata[day].count;
        dataitem.x = setposition.x;
        dataitem.y = setposition.y;
        ctx.fillRect(setposition.x, setposition.y, lineminwitdh, lineminwitdh);
        setposition.y = setposition.y + linemaxwitdh
      };
      setposition.y = 0.025 * c.width;
      setposition.x = setposition.x + linemaxwitdh
    };
    ctx.font = "600  Arial";
    ctx.fillStyle = '#aaa';
    ctx.fillText("日", 0, 1.9 * linemaxwitdh);
    ctx.fillText("二", 0, 3.9 * linemaxwitdh);
    ctx.fillText("四", 0, 5.9 * linemaxwitdh);
    ctx.fillText("六", 0, 7.9 * linemaxwitdh);
    let monthindexlist = c.width / 24;
    for (let index in gitcalendar.monthchange) {
      ctx.fillText(gitcalendar.monthchange[index], monthindexlist, 0.7 * linemaxwitdh);
      monthindexlist = monthindexlist + c.width / 12
    };
    cmessage.onmousemove = function(event) {
      document.querySelector('.angle-wrapper').style.display = 'none'
    };
    c.onmousemove = function(event) {
      document.querySelector('.angle-wrapper').style.display = 'none'
      getMousePos(c, event);
    };

    function getMousePos(canvas, event) {
      var rect = canvas.getBoundingClientRect();
      var x = event.clientX - rect.left * (canvas.width / rect.width);
      var y = event.clientY - rect.top * (canvas.height / rect.height);
      //console.log("x:"+x+",y:"+y);
      for (let item of gitcalendar.positionplusdata) {
        let lenthx = x - item.x;
        let lenthy = y - item.y;
        //console.log(lenthx,lenthy);
        if (0 < lenthx && lenthx < lineminwitdh) {
          if (0 < lenthy && lenthy < lineminwitdh) {
            //console.log(item.date,item.count)
            document.querySelector('.angle-wrapper').style.display = 'block'
            gitcalendar.span1 = item.date;
            gitcalendar.span2 = item.count;
            gitcalendar.x = event.clientX - 100;
            gitcalendar.y = event.clientY - 60
          }
        }
        //if(0< x - item.x <lineminwitdh&&0< y - item.y <lineminwitdh){
        //console.log(item.count,item.date);
        //}
      }
    }
  }
}
//数据统计算法
function addlastmonth() {
  if (gitcalendar.thisdayindex === 0) {
    thisweekcore(52);
    thisweekcore(51);
    thisweekcore(50);
    thisweekcore(49);
    thisweekcore(48);
    gitcalendar.thisweekdatacore += gitcalendar.firstdate[6].count;
    gitcalendar.amonthago = gitcalendar.firstdate[6].date
  } else {
    thisweekcore(52);
    thisweekcore(51);
    thisweekcore(50);
    thisweekcore(49);
    thisweek2core();
    gitcalendar.amonthago = gitcalendar.first2date[gitcalendar.thisdayindex - 1].date
  }
};

function thisweek2core() {
  for (let i = gitcalendar.thisdayindex - 1; i < gitcalendar.first2date.length; i++) {
    gitcalendar.thisweekdatacore += gitcalendar.first2date[i].count
  }
};

function thisweekcore(index) {
  for (let item of gitcalendar.data[index]) {
    gitcalendar.thisweekdatacore += item.count
  }
};

function addlastweek() {
  for (let item of gitcalendar.lastweek) {
    gitcalendar.weekdatacore += item.count
  }
};

function addbeforeweek() {
  for (let i = gitcalendar.thisdayindex; i < gitcalendar.beforeweek.length; i++) {
    gitcalendar.weekdatacore += gitcalendar.beforeweek[i].count
  }
};

function addweek(data) {
  if (gitcalendar.thisdayindex === 6) {
    gitcalendar.aweekago = gitcalendar.lastweek[0].date;
    addlastweek()
  } else {
    lastweek = data.contributions[51];
    gitcalendar.aweekago = lastweek[gitcalendar.thisdayindex + 1].date;
    addlastweek();
    addbeforeweek()
  }
}

fetch(githubapiurl)
  .then(data => data.json())
  .then(data => {
    gitcalendar.data = data.contributions;
    gitcalendar.total = data.total;
    gitcalendar.first2date = gitcalendar.data[48];
    gitcalendar.firstdate = gitcalendar.data[47];
    gitcalendar.firstweek = data.contributions[0];
    gitcalendar.lastweek = data.contributions[52];
    gitcalendar.beforeweek = data.contributions[51];
    gitcalendar.thisdayindex = gitcalendar.lastweek.length - 1;
    gitcalendar.thisday = gitcalendar.lastweek[gitcalendar.thisdayindex].date;
    gitcalendar.oneyearbeforeday = gitcalendar.firstweek[0].date;
    gitcalendar.monthindex = gitcalendar.thisday.substring(5, 7) * 1;
    gitcalendar.montharrbefore = gitcalendar.month.splice(gitcalendar.monthindex, 12 - gitcalendar.monthindex);
    gitcalendar.monthchange = gitcalendar.montharrbefore.concat(gitcalendar.month);
    addweek(data);
    addlastmonth();
    responsiveChart();
  })
  .catch(function(error) {
    console.log(error);
  });

//手机版更换为svg绘制
if (document.getElementById("gitcalendarcanvasbox").offsetWidth < 500) {
  gitcalendar.simplemode = false
}

//当改变窗口大小时重新绘制canvas
window.onresize = function() {
  if (gitcalendar.simplemode) responsiveChart()
}

//解决滚动滑轮时出现的标签显示
window.onscroll = function() {
  if (document.querySelector('.angle-wrapper')) {
    document.querySelector('.angle-wrapper').style.display = 'none'
  }
};</script></div><script src="/live2dw/lib/L2Dwidget.min.js?094cbace49a39548bed64abff5988b05"></script><script>L2Dwidget.init({"pluginRootPath":"live2dw/","pluginJsPath":"lib/","pluginModelPath":"assets/","tagMode":false,"log":false,"model":{"jsonPath":"/live2dw/assets/hijiki.model.json"},"display":{"position":"right","width":150,"height":300},"mobile":{"show":true},"react":{"opacity":0.7}});</script></body></html>